Wheeled scraper



May 23, 1944. p s 2,349,302

WHEELED SCRAPER I Original Filed Feb. 13, 1939 I c J? NVENTOR', F? 5. BYW Patented May 23, 1944 WHEELED SCRAPER Thomas R. Paulsen, SouthMilwaukee, Wis., assignor to 'Bucyrus-Erie Company, South Milwaukee,Wis., a corporation of Delaware Original application February 13, 1939,Serial No.

256,089. Divided and this application 1941, Serial No. 403,682

4 Claims.

My invention relates to new and useful-improvements in wheeled scrapers,and more particularly to that type of such scrapers in which the diggingedge of the bowl is pivoted with a closure known as an apron capable ofholding and carrying a substantial portion of the ex cavated dirt. Twosubtypes of such scrapers are respectively illustrated in my U. S.Patent No. 2,106,759, issued February 1, 1938, and in U. S. Patent No.2,159,045, issued May 23, 1939, to Horace C. Beitzel and myself. I

This present application is a division of my copending application,which resulted in Patent No. 2,257,761, issued October 7, 1941, andwhich application in turn was a copending continuation as to all commonsubject-matter, which includes all the subject-matter hereof, of myapplication, Serial No. 194,276, filed March 7, 1938; both of said priorapplications being for, improvements in wheeled scrapers.

I have found that, when digging loose material such as dry sand withsuch scrapers, the sand tends to roll over and over in a cylindricalform with its axis parallel to the digging lip, and to flow out of theopen digging end of the bowl just about as fast as it flows in.

Accordingly it is the principal object of this present invention toprovide means whereby the incoming sand is instead distributed well intothe bowl and the apron. This present divisional application is primarilydevoted to the method of making an essential element of my invention.

In addition to my principal object, above stated, I have worked out anumber of novel and useful details, which will be readily evident as thedescription progresses.

My invention consists in the novel parts and in the combination andarrangements thereof. which are defined in the appended claims. and ofwhich one embodiment is exemplified in the accompanying drawing, whichare hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to thesame member or to similar members.

Figure 1 is a longitudinal vertical section of a scraper embodying mypresent invention, and more particularly illustrating the passage of thesand. This scraper is here shown in its digging position.

Figure 2 is a transverse vertical section of my scraper, taken along thelines 2-2 of Figure 1.

Figure 3 is an enlarged vertical section of my digging lip, taken alongthe lines 3-3 of Figure July 23,

Figure 4 is an enlarged forty-five degree slant view of my digging lip,taken along the lines 4-4.

of Figure 3.

Figure 5 is similar to Figure 4, except that Figure 5 shows merely oneend of the blade, and

that this showing is the variant which omits the forwardly projectingcorners.

It should be noted that the representation of the dirt in Figures 1 and2 represents flow-lines,

rather than the actual condition of the dirt at any given instant.

Referring now to Figure 1, We see that I I is one of the side beams ofthe frame of my scraper.

These beams extend to a forward wheel or wheels (not shown) of anyconvenient sort, and/ or to a draw-bar (not shown) for attachment to thetractor which is to pull my scraper.

The frame is supported by wheels I2, preferably rubber-tired, of whichone is shown.

The bowl I3 is a boxlike structure, open at the top and front, andprovided with a digging blade [4 along its front lower edge. The detailsof this blade constitute the principal item of my present invention. Y

The bowl is pivoted at IS, on two links l6, of which one is shown. Otherlinkage, of which a part is shown at H, supports the front of the bowl.The bowl is raised and lowered to its three positions (digging,carrying, and dumping) by means of rope I8 and appropriate cooperatingsheaves.

The apron I9 is appropriately pivoted to the frame, and is raised andlowered by appropriate means, such as rope 20.

For the details of the operation of bowl and apron (which operationforms no part of my present invention except as generically claimed),see Patent No. 2,159,045 of Beitzel and myself, already mentioned. Foran alternative cycle, see Patent No. 2,106,759, already mentioned.

Sufiice it to say here that my invention is applicable to any scraperwhich has a digging bowl and cooperating dirt-carrying apron, whichapron opens when the bowl is in its digging position.

Turning now to Figures 3 and 4, it will be noted that my blade M has adouble curvature as there shown. That is to say, the ends of the bladeare higher and further forward than its center, and its digging edge ismore inclined than its top edge. The phrase double curvature, as used byme, is broad enough to include abrupt changes of direction asalternative and equivalent to an actual curve.

It is to be understood that, when I refer to the ends of my blade asbeing higher and/or further forward than the center thereof, thislanguage is intended primarily as a means of defining the curvature ofmy blade, and is not to be avoided by shearing off any portion of ablade thus curved. In fact, in practice, I occasionally do shear off theforwardly projecting lower corners, in a transverse vertical plane, asfor example as shown at 25 in Figure 5. This shearing-off can, ofcourse, occur either before or after any part of the bending is done.

By virtue of the double curvature of my blade, the dirt as dug isdirected substantially vertically upwardly and centrally, as shown at 2|in Figure 1, whence it spills over as shown at 22 and 23, well back inthe bowl and apron respectively, instead of merely rolling up in frontof the digging edge as in the prior art. An additional function of thisdouble curvature is that it directs the excavated material away frominterference by the sides of the bucket and the apron, as shown inFigure 2.

The method of making my particular blade consists in first bending along narrow piece of plate metal cylindrically about a longitudinal axisindicated by the point 24 in Figure 3, and then bending it cylindricallyas indicated in Figure 4, about an axis not shown, inasmuch as itsrepresentation would lie off the top of the sheet of drawings.

Either before or after bending, preferably the former, it should besharpened as indicated in Figure 3.

Either before or after bending, the lower forward corners may be shearedoil as indicated at 25 in Figure 5, and as already mentioned above.

Having now described and illustrated one form of my invention, I wish itto be understood that my invention is not to be limited to the specificform or arrangement of parts hereinbefore described and shown except asspecifically covered in the appended claims.

' I claim:

1. The method of making the blade for a dirt digging scoop whichconsists in: taking a long narrow piece of plate metal; bending theblade cylindrically about an offset longitudinal axis; bending itcylindrically about an offset transverse axis; shearing off theforwardly projecting lower corners; and sharpening the lower long edge.

2. The method of making the blade for a dirtdigging scoop which consistsin: taking a long narrow piece of plate metal; bending the bladecylindrically about an offset longitudinal axis; bending itcylindrically about an oifset transverse axis; and sharpening the lowerlong edge.

3. The method of making the blade for a dirtdigging scoop which consistsin: taking a long narrow piece of plate metal; bending the bladecylindrically about an offset longitudinal axis; bending itcylindrically about an offset transverse axis; and shearing OK theforwardly projecting lower corners.

4. The method of making the blade for a dirt digging scoop whichconsists in: taking a long narrow piece of plate metal; bending theblade cylindrically about an offset longitudinal axis; and bending itcylindrically about an offset transverse axis.

THOMAS R. PAULSEN.

